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Thus, there is only one possible reason for the decreasethe size of the jaws - that is the effect of reduced consumption. The weakeningless working parts, thanks to transmission by inheritance, becamemore noticeable in the number of further generations. Another kind of difficulty we face when we ask the question,how produced by selection of favorable modifications suchchanges in the structure of that organism to adapt to such beneficialaction, in which cooperate several different partsbody. Without much difficulty we can understand how one anythe easy part of the body in a number of generations reaches a considerable developmentif only every further increase in it contributes to the conservation of the species.It is equally easy to understand how the complex parts, for example abody can increase at simultaneous growth of functioning togetherhim parts. If the increase on the blood vessels bring it to him unusuala large amount of blood, it is only natural that the result isthe proportional increase in the size of all parts of the body: bones, muscles,arteries, veins, etc. In cases such as those described, we assume thatcooperating parts, making together one complex part, change everythingalong the same; however, nothing requires that it wasit is necessary therefore. And we do have proof that evenin such cases, when the cooperating parts are connected closely, it happenscompletely different.
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